Mega Man Classic Weapon Fusions

[Gmerr]

Junk Shield + Leaf Shield + Skull Barrier + Jewel Satellite + Scorch Wheel + Plant Barrier + Star Crash + Mirror Buster = Infinity Barrier

It has the 8BDM effects of all the barriers (more armor, more speed, invincibility and reflection, hugging damage and healing) but, like the pre-V4 Skull Barrier, it consumes all weapon energy in one shot, and, like the Time Stopper, can't be refilled. Shield time is approximately 10-15 seconds.

[Oliver]

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Lightning and Thunder
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Astro Crush + Lightning Bolt = Lightning Crush: Summons Astro Crushes in high speed and when they land, it creates a shockwave.

Spark Shock + Slash Claw = Thunder Claw: Stuns enemies, if gets slashed.

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Ice
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Chill Spike = Metal blade = Chill Blade: Throws a cold metal blade. Slower than a normal metal blade.

Freeze Cracker + Rolling Cutter = Frozen Rolling Cutter = Fires a freeze cracker. When the freeze cracker hits the ceiling/floor/wall, it spreads out rolling cutters instead of small freeze cracker bits.

[Blutorus]

Metal Blade + Rebound Striker = Rubber Saw

Throws a Metal Blade like normal, only instead of heading in one direction forever, it can bounce off of walls and has gravity. Like Screw Crusher, but can be thrown in different directions for different amounts of momentum.

[shizuo]

Those fusions are really cool specially the Chill Spike = Metal blade = Chill Blade: Throws a cold metal blade and Dive Missile + Ballade Cracker = Super Missile.
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hunting knife

[Doctor Jughu]

Blackhole+(you know hornets weapon)

Creates a giant blackhole were hornets are coming from

[Alphaman]

Stone + Star: Stone Shield
Act like star crash but when you throw,acts like power stone -OPNESS: 50%

Hard + Pharaoh: Hard Shot
Can be charged,when uncharged does the same damage of mega man's charged buster,but when charged,does 4 hp of damage - OPNESS:70%

Bright + Crash : Time Crasher
Stop the time and every enemy who you freezed will have a crash bomber,and when the time goes back to normal the crash bomber will explode,it's useful for mets - OPNESS:95%

[Shyster]

I actually think about this stuff a lot of the time. So, presenting the MM3 fusions, in the context of the original mm3.

Magnet+Hard = Magnet Knuckle. Hits like hard knuckle, but you can direct it anywhere on the screen with the control pad
Magnet + Top = Magnet Spin. Spin in mid air and small enemies will be drawn toward you and crushed.
Magnet + Shadow = Homing Blade. Acts like shadow blade, but flies in a straight line at enemies instead of boomeranging back.
Magnet + Spark = Magnetic Shock. Acts like spark shock. When one enemy is shocked, nearby foes and bullets are pulled toward it and paralyzed too.
Magnet + Snake = Leaping Cobra. Acts like Search Snake. When the snakes line up with an enemy vertically or horizontally, they jump and fly into it.
Magnet + Gemini = Rebound Missile. Acts like Magnet Missile, but the magnets bounce of enemies while still doing damage, and can turn and hit another enemy again after doing so.
Magnet + Needle = Magnetic Barrage. Rapid fire missiles that turn like Magnet Missile. What more could you want?

Hard + Top = Windup Punch.  A melee attack used on the ground. Does as much damage as a hard knuckle, but can be charged for even more damage. Enemies hit fly backwards, and can damage others
Hard + Shadow = Heavy Blade. Fire a black shuriken in 8 directions that is affected by gravity. Has recoil, and can be used to gain momentum in any direction.
Hard + Spark = Shock Punch. Fires a Hard knuckle that paralyzes any enemy that it hits and pushes them backwards into walls.
Hard + Snake = Serpent Glove. A Hard Knuckle that drops search snakes traveling in the direction of the fist.
Hard + Gemini = Ricochet Fist. Hurls a Hard Knuckle that reverse course when it hits a wall. Can still be directed up or down, and gains power with more bounces like rebound striker.
Hard + Needle = Needle Flak. Low fire rate. Shoots bursts of needles forward shotgun-style. Still has recoil.

Top + Shadow =  Shadow Strike. When spinning, a shadow blade is thrown in the direction of any enemies in its range.
Top + Spark = Shock Wave. A circular wave of electricity is emitted every time you spin, paralyzing any enemies, which can then be dispatched with the spin itself.
Top + Snake = Snake Dash. Used on the ground. Launch forward, break-dash style, traveling up wall and ceilings as long as the dash lasts.
Top + Gemini = Soul Spinner. Spinning in mid air launches a slow spinning clone projection that bounces off walls for a short time, shredding any enemies.
Top + Needle = Needle Spiral. When spinning, weak needle projectiles are launched around you in every direction.

Shadow + Spark = Paralyzing Blade. A Shadow Blade that paralyzes. Yes, it does damage, so go wild!
Shadow + Snake = Ground Fang. A Shadow Blade that travels along any surface when it hits it, and returns to you as best as it can along the ground after a while. Think Yo-Yo cutter from MMU.
Shadow + Gemini = Bounce Blade. A Shadow Blade that can be aimed in 7 directions that bounces off walls. Has a longer range than the original Blades, and continues bouncing if there are any walls in the way of its return trip.
Shadow + Needle = Shard Barrage. Rapid fire Shadow Blades in any direction! Slight spread and longer range than the originals.

Spark + Snake = Shock Bite. Search Snakes that paralyze and do damage. Go nuts with these too.
Spark + Gemini = Multi Spark. Enemies paralyzed by this bouncing spark shock will emit more bouncing sparks at random angles. Does slight damage.
Spark + Needle = Spark Cannon. Rapid fire needles straight forward with paralysis. Enough said.

Snake + Gemini = Soul Snake. Fires a gemini laser that generates glowing snake outlines that travel along walls whenever it hits a surface.
Snake + Needle = Snake Stream. Rapid-fire Search Snakes forward at various angles.

Gemini + Needle = Scrambler Laser. Rapid fire Gemini Laser. Slight variations in firing angle creates bouncing laser chaos!

[Superjustinbros]

I actually had a few ideas regarding MM3 fusions, but with this full set I'm willing to use these for the Orange weapon group, since it seems like they would work.

Yeah the idea is to make some of these weapons easy to deal damage and get kills with, since that's the law I always went by when I designed my own weapons. The cost is that the hybrid powers would drain weapon energy from both bars, so if you used Leaping Cobra but then decided to go back to Search Snake or Magnet Missile, you'd have less ammo for the two weapons on their own, or vice versa. If one bar is empty, the fusion weapon cannot be activated. Weapon pellet/capsule pickups will replenish ammo for both active weapons.